Journal of Plant Disease Sciences
Year : 2009, Volume : 4, Issue : 1
First page : ( 38) Last page : ( 43)
Print ISSN : 0973-7456. Online ISSN : 0976-2388.

Use of Non Chemical Methods in Mamagement of Phomopsis Fruit Rot of Aonla

Choubey Sanjeev, Patil R.K.

Department of Plant Pathology, B. A. College of Agriculture, Anand Agricultural University, Anand -388 110 (Gujarat)

Abstract

Nine phytoextracts (10%) were studied to know the efficacy fOf controlling the Phomopsis fruit rot of aonla in vitro and in viuo conditions. In vitro all the phYtoextracts screened (10%) were found significantly superior in inhibiting the mycelial growth of P. phyllanthi over control. Significantly lowest mycelial growth was recorded in garlic clove extract (12.63. mm) showing 84.94 per cent mycelial growth inhibition over control. The next best treatments in order of merit were ardusi (18.50 mm) and neem leaf extract (18.87 mm) showing 77.94,and 77.50 per cent mycelial growth inhibition, respectively. Ginger rhizome extract found least effective in inhibiting the mycelial growth of P. phyllanthi (58. 12%). Garlic clove extract (10%) proved. most effective in reducing the Phomopsis rot severity both in pre-(17.55%) and post-inoculation (18.25%) treatments followed by ardusi (21.11 & 21.49%) and neem leaf extract (21.40% & 21.55%) after 7 days Gf inoculation. Ginger proved least effective in controlling the rot caused by P. phyllanthi both in pre-(27.91%) and post-inoculation (28.79%) treatments. Three antagonists i.e. Trichoderma viride, T. harzianum and r. wens were screened in vitro against P. phyllanthi by dual culture technique. The highe.st !llycelial growth inhibition of P. phyllanthi was recorded in T. harzianum (67.52%) followed by T. viride (66.65%): Trichoderma wens was found least effective in inhibiting the mycelial growth of the pathogen (62.93%). Pycnidia production was not observed in any treatment except control. In, uivocondition T. harzianum (18.59 & 20.11%) was fOUnd most efficient antagonist in reducing the severity Phomopsis rot severity followed by T. viride (19.82 & 20.37%) in pre-and post-inoculation treatments after 7 days of inoculation. Severity of Phomopsis rot was Significantly lowest in fruits exposed to aerated steam at 55°C for 10 min. (l.28%), but the fruits exposed to 55°C for 10 min. 'show~d changes in fruit colour and firmness. Among all treatments, 50°C temperature Jor 10, mnrecorded lowest severity (12.92%) without any changes in fruit colour and firmness. It was revealed that aerated steam treatment at 500c for 10 min found best for controlling the Jlhomopsis rot caused by p, phy/lanthi without hampering the' fruit quality.

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Keywords

Aerated steam, Bio-agents, Phomopsis rot, Phytoextracts..

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